The first of the 24 solar terms in the China lunar calendar is the Spring Festival, right?

Wrong. First of all, the Spring Festival is a traditional festival in China, but it is not one of the 24 solar terms. Secondly, the first of the 24 solar terms is beginning of spring, which was considered by the ancients to be beginning of spring, and the time is generally between February 3rd and 5th in the Gregorian calendar. Therefore, in some lunar years, there will be two beginning of spring, while in some lunar years, there may be no beginning of spring.